If it's a mink you should be able to catch it in a small box trap. If your traps aren't working then maybe it's a weasel. This is not my picture but I make my weasel traps just like this one. The box must have a top on it to work...they removed it to take the picture of the inside.
You don't have to make a wood box... a small plastic tote type box will work. Just make sure you get the rat trap with the big yellow 'pan' like in the picture and that the jaw clears the top of the box when the trap fires. The entrance hole should be a two inch circle about three inches from the bottom.
cool looking trap .. almost makes me wish I had something to trap..
maybe I will rig up something like that for mice..
Edited by jvls1942 - 11/21/15 at 3:34pm